20031011 has 16 divisors (see below), whose sum is σ = 26896128. Its totient is φ = 14407200.

The previous prime is 20030987. The next prime is 20031029. The reversal of 20031011 is 11013002.

It is a cyclic number.

It is not a de Polignac number, because 20031011 - 2¹⁸ = 19768867 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20031011.

It is not an unprimeable number, because it can be changed into a prime (20031041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9005 + ... + 11006.

It is an arithmetic number, because the mean of its divisors is an integer number (1681008).

Almost surely, 2^20031011 is an apocalyptic number.

20031011 is a deficient number, since it is larger than the sum of its proper divisors (6865117).

20031011 is a wasteful number, since it uses less digits than its factorization.

20031011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20042.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 20031011 is about 4475.6017472514. The cubic root of 20031011 is about 271.5819838851.

Adding to 20031011 its reverse (11013002), we get a palindrome (31044013).

Subtracting from 20031011 its reverse (11013002), we obtain a square (9018009 = 3003²).

The spelling of 20031011 in words is "twenty million, thirty-one thousand, eleven".